All of the following statements concerning ANP are true Except
**Core Concept**
Natriuretic peptides (ANP) are hormones produced by the heart in response to increased stretch and pressure, playing a crucial role in regulating fluid balance, blood pressure, and electrolyte homeostasis. ANP exerts its effects by increasing sodium excretion, promoting vasodilation, and inhibiting the renin-angiotensin-aldosterone system (RAAS).
**Why the Correct Answer is Right**
The correct answer will be the statement that does not accurately describe the properties or functions of ANP. ANP is a potent diuretic that increases sodium excretion by inhibiting the reabsorption of sodium in the collecting ducts. It also promotes vasodilation by stimulating the production of cyclic GMP, leading to relaxation of vascular smooth muscle. Additionally, ANP inhibits the release of aldosterone from the adrenal cortex, further reducing sodium reabsorption.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because ANP is not primarily involved in increasing blood glucose levels. Instead, it plays a role in regulating fluid balance and blood pressure.
**Option B:** Incorrect because ANP does not directly stimulate the release of antidiuretic hormone (ADH). However, it may indirectly affect ADH release by influencing the volume and pressure of the blood.
**Option C:** Incorrect because ANP does not have a significant effect on the parasympathetic nervous system. Its primary actions are related to the renin-angiotensin-aldosterone system and the sympathetic nervous system.
**Clinical Pearl / High-Yield Fact**
ANP levels are often elevated in conditions such as heart failure, where the heart is under increased stretch and pressure, leading to increased production of ANP. This can be a useful diagnostic marker for heart failure.
**Correct Answer:** A.